[TR] TR4 upper A-arms front suspension?

[TR250Driver at aol.com]

Hey Guys,
I'm working on the 63 TR4's front suspension. This is the later type  with 
front & back upper A-arms. I am confused for some reason as to  which is 
which?  Yikes I should know this!  I am going to say that the  arm with the 
bigger curve in it is the front.  Then the one that is not  curved as much is 
the back.  I'm looking at the various assembly diagrams  and I can't really 
tell from those.  I don't want to be wrong and have a do  over.  Can a anyone 
confirm this?  I would really appreciate it.  
Thanks,
Darrell